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Parambadath, Surendran,Mathew, Aneesh,Kim, Su Yeon,Park, Sung Soo,Ha, Chang-Sik International Union of Pure and Applied Chemistry 2018 Pure and Applied Chemistry Vol.90 No.5
<P><B>Abstract</B></P><P>The direct removal of arsenate (AsO<SUB>4</SUB><SUP>3−</SUP>) and chromate (CrO<SUB>4</SUB><SUP>2−</SUP>) from water were achieved using a Fe<SUP>3+</SUP>-bis-ethylenediamine complex-bridged periodic mesoporous organosilica with a 20% organosilane content (Fe-EDPMO-20). The bridged Fe<SUP>3+</SUP>-bis-ethylenediamine complex was introduced to the pore wall of the PMO by combining the pre-complexation and co-condensation processes. N,N′-bis[3-(triethoxysilyl)propyl]ethylenediamine (TESEN) and tetramethyl orthosilicate (TMOS) as silica precursors were used with cetyltrimethylammonium bromide (CTABr) as a surfactant under basic conditions for the preparation of highly ordered Fe-EDPMO-20. Transmission electron microscopy, X-ray diffraction, and N<SUB>2</SUB>adsorption-desorption measurements confirmed that the Fe-EDPMO-20 had an ordered hexagonal p6mm mesostructure. The material had a Brunauer-Emmett-Teller surface area of 734 m<SUP>2</SUP>g<SUP>−1</SUP>, pore diameter of 2.6 nm, and pore volume of 0.61 cm<SUP>3</SUP>g<SUP>−1</SUP>. UV-vis and X-ray photoelectron spectroscopy confirmed that Fe<SUP>3+</SUP>was embedded in the coordination site by the nitrogen atoms from ethylenediamine. The adsorption efficiencies of arsenate and chromate ions by Fe-EDPMO-20 were examined as a function of pH, stirring time, amount of adsorbent, and initial concentration of metal ion solution. The maximum adsorption for arsenate and chromate were 156 and 102 mg g<SUP>−1</SUP>within 6 and 24 h, respectively, at pH 4.</P>
Mary Jenisha Barnabas,Surendran Parambadath,하창식 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
layered double hydroxide-mesoporous silica core–shell nanostructure (LDH@mSiO2) with perpendicularly- oriented mesochannels was synthesised using a surfactant-directing method and modified with amine functionality for drug delivery applications. Mg/Al-layered double hydroxide (Mg/Al-LDH) materials with a disc-like morphology were synthesised and then coated with mesoporous silica (Mg/Al- LDH@mSiO2) via the functionalisation of (3-aminopropyl)triethoxysilane using a post-synthesis route (NH2-Mg/Al-LDH@mSiO2). The materials were characterised using a range of techniques. The Mg/Al- LDH@mSiO2 and NH2-Mg/Al-LDH@mSiO2 materials possessed a spherical morphology and good porosity. Ibuprofen (IBU) and ciprofloxacin (CIPRO) were loaded into the pore channels of the NH2-Mg/ Al-LDH@mSiO2 and the release properties were examined at pH 4.0 and 7.4. The delayed release property exhibited by NH2-Mg/Al-LDH@mSiO2 was attributed to the strong interactions of the drug molecules with the surface amino functionality and the charged LDH surface. The release profile from NH2-Mg/Al- LDH@mSiO2 was also compared with that of the Mg/Al-LDH@mSiO2 system under identical conditions. The porosity and functionalisation of the mesoporous silica shell and the surface charge density of the layered structure of Mg/Al-LDH are the major reasons for the controlled release of the cargo molecules. Moreover, the favourable delay in drug release from both materials at pH 4 was attributed to the higher level of ionisation and dissolution than at pH 7.4.
Silver (I)- Schiff-base complex intercalated layered double hydroxide with antimicrobial activity
Barnabas, Mary Jenisha,Parambadath, Surendran,Nagappan, Saravanan,Chung, Ildoo,Ha, Chang-Sik Techno-Press 2021 Advances in nano research Vol.10 No.4
In this work, silver nitrate complexes of sulfanilamide-5-methyl-2-thiophene carboxaldehyde (SMTCA) ligand intercalated Zn/Al-layered double hydroxide [Ag-SMTCA-LDH] were synthesized for the potential application as an antimicrobial system. The SMTCA ligand was synthesized by reacting sulfanilamide and 5-methyl-2-thiophene carboxaldehyde in methanol and further complexation with silver nitrate metal ions [Ag-SMTCA]. The structural analyses of synthesized compounds confirmed an intercalation of Ag-SMTCA into Zn/Al-NO<sub>3</sub>-LDH by flake/restacking method. SMTCA, Ag-SMTCA and Ag-SMTCA-LDH were characterized by <sup>1</sup>H nuclear magnetic resonance (<sup>1</sup>H NMR) spectroscopy, Fourier-transform infrared (FTIR), ultraviolet-visible (UV-Vis) spectrophotometer, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It was found that Ag-SMTCA-LDH exhibited good antimicrobial activity against both gram-positive (Bacillus subtilis, [B. subtilis], Staphylococcus aures, [S. aureus]) and gram-negative (Escherichia coli, [E. coli], Pseudomonas aeruginosa [P. aeroginosa]) bacteria as well as excellent antioxidant activity.
Kim, Su Yeon,Parambadath, Surendran,Park, Sung Soo,Ha, Chang-Sik American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>The silica wall surface of SBA-15 was modified with (3-chloropropyl)triethoxysilane (ClPTES) to tailor its properties for specific applications (Cl-SBA-15) after removing the surfactant by calcination. Cl-SBA-15 was also modified using melamine (Mel-SBA-15) and chlorosulfonic acid (SUP-SBA-15) by a two-step post modification process. The physico-chemical properties of SBA-15 and the organically modified materials were characterized using a range of spectroscopic and microscopic techniques and N2 sorption experiments. SUP-SBA-15 showed excellent adsorption selectivity of 95 and 89% towards Li+ ions from artificial seawater and wastewater, respectively. Rapid adsorption equilibrium was achieved for the adsorption of Li+ ions from both artificial seawater and wastewater. In addition, the selectivity of Li+ adsorption decreased with increasing temperature. The ion-exchange mechanism played the crucial role in the selective adsorption of Li+ ions in addition to the steric hindrance, charge repulsion, and chelating structure of ligand.</P>
Rana, Vijay Kumar,Park, Sung Soo,Parambadath, Surendran,Kim, Mi Ju,Kim, Sun-Hee,Mishra, Satyendra,Singh, Raj Pal,Ha, Chang-Sik Royal Society of Chemistry 2011 MedChemComm Vol.2 No.12
<P>In this communication, we report the facile synthesis of hierarchical mesoporous bio-polymer/silica composite materials with bimodal mesopores using a dual-template of the cationic <I>N</I>,<I>N</I>,<I>N</I>-trimethyl chitosan (TMCs) and the anionic sodium dodecyl sulfate (SDS) <I>via</I> one-step synthetic strategy. Tetraethoxysilane (TEOS) was used as a silica source. The nitrogen adsorption/desorption measurements and transmission electron microscopy analysis showed the hierarchical structure of the mesoporous bio-polymer/silica composites with bimodal mesopores having an average pore size of 5–7 nm with the visible voids between the silica nanoparticles, which allow the mesoporous bio-polymer/silica composites to encapsulate a large number of guest drug molecules, Ibuprofen (IBU) or 5-fluorouracil (5-FU), due to their high surface area and pore volume. In addition, the mesoporous chitosan–silica composites also had a long term biocompatibility for the target release of the drug molecules to the CEM cells, MCF cells, <I>etc.</I> as well as a pH sensitive controlled release behavior of the drug molecules.</P> <P>Graphic Abstract</P><P>A facile, dual-template method was reported to synthesize hierarchical mesoporous bio-polymer/silica composite materials with dual mesopores for controlled drug delivery. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0md00222d'> </P>